CPA4 and breast cancer: Focusing on triple-negative breast cancer (TNBC) cells, a particularly aggressive subtype of breast cancer, UALCAN dataset analysis revealed that CPA4 mRNA levels were elevated in TNBC, especially in the TP53-mutant subgroup, which were found to be critical for both cell growth and migration, leading to a poorer prognosis for patients in this sub-population [25].